Project, can't find problem.

I have this basic little porject for class and I can't seem to find what's wrong in it. It looks good to go in my eyes, but when I go to check it nothing appears.....have a look. It's due tomorrow morning...:D

<script type="text/javascript">

/* Start code and set up some variables

*/

var name = prompt("Enter your name:");

alert(name + ", You need to do a few more calculations.");

var one = prompt("enter First Number:",0);

var two = prompt("enter Second Number:",0);

/* Parse the numbers given

*/

var numone = parseFloat(one);

var numtwo - parseFloat(two);

/* Do Calculations

*/

var add = numone + numtwo;

var subtract = numone - numtwo;

var multiply = numone * numtwo;

var divide = numone / numtwo;

var squareone = numone * numtwo;

var squaretwo = numone * numtwo;

var sumsquare = squareone + squaretwo;

/* Print results

*/

document.write("<center><h1><u>Assignment 1 - Sample Solution</u></h1></center>");

document.write("\xA0The first number you entered was: " + numone + "<br>");

document.write("\xA0The second number you entered was: " + numtwo + "<br><br>");

document.write("\xA0Here are the calculations I performed with them:<br><br>");

document.write("Addition: " + numone + " + " + numtwo + " = " + add + "<br>");

document.write("Subtraction: " + numone + " - " + numtwo + " = " + subtract + "<br>");

document.write("Multiply: " + numone + " x " + numtwo + " = " + multiply + "<br>");

document.write("Divide: " + numone + " / " + numtwo + " = " + divide + "<br>");

document.write("<h3>Squared</h3>");

document.write("Square One: " + numone + "<sup>2</sup> = " + squareOne + "<br>");

document.write("Square Two: " + numtwo + "<sup>2</sup> = " + squareTwo + "<br>");

document.write("Sum of Squares: " + numone + "<sup>2</sup>" + numtwo + "<sup>2</sup> = " + sumSquare);

</script>

Any help is appreciated, I'm kinda new to javascript.